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No Heat, No engine temp on guage, Thermostat stuck open? 700

posted by  encinoman on  Mon Feb 13 07:47 CST 2006
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Hi,
For a few months I thought the temp guage on my 1990 740 wagon was sticky. If I tapped the dash, sometimes it would show OK.
But, now that winter is here, no amount of tapping shows any engine temp. Plus I can get a tiny bit of heat, but not enough to stay warm, plus it hit me the other day when I was driving and could see the exhaust in my rear view mirror, even though the engine had been on some time.

I think it's simply running cold. How likely is it that the thermostat is stuck open?

Everything else runs fine. I'm out of town right now, and can't check if the heater hoses build pressure. (didn't want to drive for hours if the engine wasn't heating up)

Thanks.






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